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Medical Term:

Réaumur scale

Pronunciation: rā-ō-mūr′

Definition: a thermometer scale in which each degree Réaumur (°R) is 180 of the temperature difference between the freezing point and boiling point of pure water at 1 atm, with 0°R set at the freezing point and 80°R set at the boiling point of water.

[René A. F. de Réaumur]